UI-Kennlinienmeßgerät für Solarmodule und -generatoren


UI-Kennlinienmeßgerät für Solarmodule und -generatoren

PVPM Users Manual Page 51


13 Glossary

13.1 Azimuth (ß) and elevation (α)

For the effective use of solar radiation the modules and

collectors are arranged in a way that makes a preferably large

solar crop possible. In this connection the wave angle of the sun,

but also the 'azimuth' and the elevation of the modules and

collectors play a certain part. The azimuth angle specifys with

how many degrees the surface of the modules or the collectors

diverge from the exact adjustment to the south. The elevation

pertains the deviation from the horizontal. Studies substantiate

that solar plants with an azimuth of 0° and an elevation of about

30° are aligned in the best possible way. Nevertheless small

deviations are not implicitly problematic: with the orientation to

south-east or south-west still around 95% of the possible crop

can be realised. Larger plants are, to enhance the profit,

reorientated towards the sun by electric motors. (see as well


For measurements with the PVPM the accurate arrangement of

the insolation sensor with the modules is very important. The

sensor has to 'see the same sky' as the modules. At the same

time it is to be taken in account that by reflections from the

environment (by house walls or other light surfaces) the

incidence of light on the modules and the sensor can be

intensely influenced.

13.2 Slope of the roof

When planning a solar plant the question for the slope of the roof

(e.g. on the internet) leads to wrong conclusions, as it is not the

slope of the roof, but the slope of the collectors. Through an

appropriate elevation and attachment the collectors can be

brought into a good position even if the slope or the adjustment

of the roof are disadvantageous.

PV-Engineering GmbH

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